Method of and apparatus for feeding water to boilers



' y 1930- v. v. VEENSCHOTEN 1,757,028

METHOD OF AND APPARATUS FOR FEEDING WATER To BOILERS Filed May 1'7, 1922 2 Sheets-Sheet l F Z WM May 6, 1930; v. v. VEENSCHOT EN 1,757,028

METHOD OF AND APPARATUS FOR FEEDING WATER TO BOILERS Filed May 17, 1922 2 Sheets-Sheet 2 Fig. 1 shows a boiler. 1 Fig. 2 a section ofthecfittingzconnecting Patented May 6,' 1930 UNITED STATES PATENT p OFFICE VINCENT .v. .vEENscHoTE F ERIE, PENNSYLVANIA, AssmNon To NORTHERN .EQUIPMENT COMPANY, or ERIE, PENNSYLVANIA, CORPORATION or PENNSYL- V NIA [M THOD or APPARATUS Fen FEEDING WATER T0 BOILERS" l Application filed lllay 17;

' invention is designed to control the 'feeding of water to a boiler andis 'ofparticular-utility in connection with boilerssub-' 'jected to wide rangesof pressure; Control-- '5 ling devices for-feeding water to boilers have heretofore been made whichqope'rate with a I closeness and give satisfactory. results, such 7 for instance; as tlie'control'ling device shown in the R. W. Andrews Patent, #1 148A83 where: the boiler-pressures are comparatively constant or desired tolbe constant butwhere theyboiler pressuresvary widely as in automobile constructionor similar environments the variation in'temperature of the stearn due '15 tovariations in pressure seriously interferes lwith theproper functioning of thedevice- In the present invention this difl'iculty is obviated bysubj ecting the comparatively static element of the controlling instrument to the action of steam so that as the steam pressure varies with a consequent variation in temperature this disturbing factor is compensated for -.-byan action ofthe steam on this compara- 2 tively static element.

The, invention further consists in'control ling't-he feed of'the feedwat-er with'an expansion element by bypassing'the excess of feed water. 3

The invention further-involves the features 90f construction and method which will-"be hereinafter more particularlyfset forthinthe .specification and claims."

f Theapparatus is illustrated in the accornpanying drawings as follows r e I the static element and 'expansionelernent and including an elevation of; the T controlling valve,

5 a Fig. 3 a section on the 'line 3-3.in Fig. 2.

' Fig. t asection on the. line 4f4 in Fig.3. g

4 expands or contracts this; movement is con- -veyed through the lever 12 to the lever 27 and the-bypass valve actuated. 'Thiscong p v 1 ,struction permits of a'wide movement of the; An expansion tube 4 is rigidly connected to a fitting 5, the fitting being connected by "a pipe 6 to the steamspace of the boiler. This f l -expansion tube is inclined andithe water level the lever againstany slack. .Feed water is delivered to the boiler from 'l' the pumpthrough a pipe 18,-a check valve'1'9 the section being on the line 242 in 'Fig.a3.

1922". SeriaI 'No. 561,726.

space of. the boiler.

-A-1A is normally about Iadwa ef the 7 'pansion tube. The lower end oftheexpa'nsion The normally static element ofthe device isin thefonn ofa tube 9 connected with the fitting 5. 'This tube is constantly subjected tothesteam'from the boiler. The opposite end of the tube!) is connected with a fitting :10-and the; fittinglO is connected by a flexible .pipe 11' with the fitting-7 to'prevent the formationfofi a dead end in the .pipe 9. I 3

A controlling lever 12 is in the form of two plates ora'rmswhich straddle the expansion tube 4;. The plates are connected by an end piece 12 and are pivotedon pinslS extend ingfrom thefitting 7. A stud 14 extends from the fitting 10 through the plate 12 'and a nut 15. is screwed onthe stud 14 against the y plate forming a fulcrum for-the lever. A plate 16 connects the arms of'thelever at the free end of the lever andla spring 17' extends 1 from this plate to the fitting 5., thus holding being provided intheusual-manner. ,A pipe [20 leads from the pipe 118' to acon'trolling valve 2'1 and a pipe 22 leads :from-the con-;

. The controlling valve has a bodyf23 with V a a way'24: through} it, a valve plug 25"control lingtliepa'ssa'ge' through the body, the plug having a way 26 adapted to be broughtinto register with the'way 24. lever 27 is fixed on the plug 25 and thislever is connectedby a link with the the lever 12.

plate "16 on" the free end of 'It,will*readily be seen that asthetube 4 free end of the lever with a very: small move- 7 ment of the expansion tube. .The double arm construction of lever balances the stresses so the tube at varying with steam pressures and consequently steam temperatures. Where a the static element is a constant bar it does not take care of these variations so that withiwide variations the response to: diflerences in levels of water in the expansion tube is not what it should be. With this construction differences in level in the expansion'tube are gradually open and closewthe bypass.

thermal expansion but preferably by adjust- I alsoi's taken care of in utilizing the :varia- -tions inthe level of waterjto take care off water will give a perceptible lag in the water supply to the boiler-requirements to which responded to correctly regardless of the steam pressure. I a

The .way26 is of sufficient amplitude to This bypass is :normally open to some extent so that there is a constantteeding of water varying as the requirements vary." There is also in'the construction alagwhich is fully described in the Andrews patent referred to in that the water level shifts so that as thereis agreater discharge of steam the pull on the boiler isrelieved to soine'extent by dropping of the water level. This is accomplished in the structure shown either bymaking the expansion tube with a'coeflicient of mg the size of the valve opening to the ordis nary boiler requirements so that the feedthe apparatus responds. On the'othe'rhand, with aconstant demand the water-level remains comparatively constant. It will be ticularly designed for boilers subjected to such wide variations in demand as to very materially changethe steam pressure! This Q momentary variations in'fsteam discharge. It will be noted -that the bypass is ot such amplitude that while it can vary theopening with the way' 24 it cannot "be swung to such an extent as totend to closethevalve ofthe valve by over-travel. V

with an extreme movement; Consequently where there is a movement past what would normally openthe valve whereas no closing 7 The expansion tube 4 operates on the same principle as in the Andrews patentiabovef greferred 'tofthat is tosay, the water in the] 'tub'e is'at a materially lower temperature than the steam in said tube, Consequently 1 with a lower water level-in thetube the tube 1 as a whole'is expanded to afgreater extentthan Vv'lIBIBftllGIBlS ahigher Water level in thetube because a'greater portion ofthe tube is subject to the higher'temperature ofthe r steam. "On the other hand with a higher level (if water in the tube a greater portion of the'tube is subject to the water temperature and consequently the tube as a fwholefis at a the relative movement trolling the device.-

lower temperature and in consequence contracts. 1 a

lVhat Icla1m as new is 1. In tin-apparatus for feeding water to I boilers, the combination of aboiler; an incoeflicients and relative wateriand steam 6X1 posures to neutralize variations incident to {variations in steam vpressure; a feedwater device; and means actuated bythe relative movement of sa d tubescontrolling the deviceQ -f' .7 2.In 'an apparatusfor feeding ,water'to boilers; the combination of a boileryan iiiclined expansion tube connected to ,thewaterl and steam spaces of the boiler,thetube-crossing the water line golf. the boiler; a comparatively static element in the forms of ;a% tube opera-tive'ly connected at one .end to the expansion tube and connected to the steam space( t-the boiler said tubes having expansion coefiicients and relative water and steam exposures to neutralize variations incident to variations in steam pressure; afeed water device} and means actuated by the relativea ms inovem'ent of. said tubes icontrollingfisaid "device i' hi' I c a 3. Iii-an apparatus'forfeeding waterlto f boilers, the combination of 'aboiler; an inclined expansion element in'theforrn 'of a tubeconnectedto the-waterand steam spacesf understood, however, that this device ispar of thegboiler the tube crossing the water line of the boiler a comparatively static element operatively connected at oneend tootlie EX- feed water deviice; and means actuated by of said elements "conp 7 ki'io g 4E. In;' an apparatus; for feeding Water-to boilers,ithel combinationpf a-boiler; an ex: pansion element: in the form ofv an nclined 7 tube connected .tothe stearn :andwater spaces of the boiler; a co'inparatively static element" operativelyjconnected to one end of the expansion element feed water device; and a lever controlling the feed water Idevice formed of twoarms, one at each side ofith'etubeysaid arnis extending the; major" portion ofithe" length of'said tube'and operatively connected at its free end to the feedwater device and at its opposite; end -to the tube andele'n'ient at points remote-from the connectionbe-j; v

7 an apparatus for feeding'waterlto j boilers, the conibination of. a boiler; an ex tween the tube andfelernent;

pansion-element inthe form ofan' inclined 'tubc connected to the steam'andwatenspaces of the boiler a comparat vely static element' operatively connected at one end to theex pansion" element; a feed water device and a lever controlhng the feed Water device formed of two plates straddling the tube and extending throughout the major portion of the tube, said lever being'operatively connected at opposite sides of said tube and to said static element at points remote from the connection between saidtube and'said velement. 1 i

6. In an apparatus for feeding water to boilers, the combination of a boiler; an expansion element 11111118 form of an 11161111861" tube connected to the steam and water spaces of the boiler; a comparatively static element operatively connected atone end to the ex-- pansion element; a feed water device; a con- 7 trolling lever formed of two platesstraddling the tube and extending throughout the major part of the length of the tube and connected to the tube;- an end piece between v the plates; an adjustable connection between 1 a the static element and the end piece, the connections between the lever and the tube and between the end piece and the element being remote from the connection'between the tube I and element; a bridge piece between the o plates at the opposite end of thelever from a said elements *with variations of pressurethe end piece; and fa connection between the bridge piece and the feed water device;

7. The method of feeding water to boilers having as a means of'control thermal ele ments, one of which is exposed to steam pressure and to a varying exposure of steam and 1 water with variations of water level and'in which the expansion of said element due to variations in the water and steam is utilized through connection with the other element V which is comparatively static in controlling the water supply which consists in maintains ing a substantially constant relation between through the application ofsteam by expanding both elements in response to variations of steam pressure In testimony whereof-I havefhereunto. set I my hand.

vmonNTIv. vE NscHoT N. v 

